Stone sawing apparatus



Nowes, 1952 Filed April 25, 1952 w. D. .lcoHmsoN 2,619,081

STONE.I SAWING APPARATUS 5 Sheets-Sheet l INVENTOR. w/u. MM o. JOHNSON,

TTOE/VEYS.

Nov. 25, 1952 w. D. JOHNSON STONE SAWI'NG APPARATUS 5 Sheets-Sheet 2Filed April 25, 1952 Nov. 25, 1952*. w. D. JvoHNsoN 2,619,081

sToNE sAwING APPARATUS 5 Sheets-Sheet I5 Filed April 25, 1952 IN V ENTOR.

WML/AM D. JOHNSON,

Nov. 25, 1952 w. D. JOHNSON sToNEsAwING APPARATUS 5 Sheets-Sheet 4 FiledApril 25, 1952 (0 0) (0 C) (O 0) l0 O) L0 O) (0 0) (O o) LO O) (O O) (0INVENTOR.

N, E mm @fr A D. m MA M w Nov. 25, 1952 w. D. JOHNSON 2,619,081

STONE sAwING APPARATUS Filed April 25, 1952 5 Sheets-Sheet 5 FIG. JO.

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IN VEN TOR.

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Patented Nov. Z5, 1952 UNITED lS TATES PATENT OFF I CE STONE S'AWINGAPPARATUS William D. Johnson, Austin, Tex.

Applicationv April 25, 1952, Serial No. 284,411

(Cl. 12E-14) `'I'Claima 1 VThis invention relates to stone sawingapparatusI and more particularlyto apparatus vfor sawing vstone slabsrinto brick shaped, rectangular blocks knowny to the trade asRo-manstone.

y'It is among the objects yof the invention :to provide an improvedapparatus or mechanism Which'will receive stone slabs of apredeterrnined4thickness and inone yconti-nuoi-is operatiornreduce the vslabs tobrickshaped rectangular blocks known to the trade as "Romanstone whichperforms the successive sawing steps onl a slabwhile the-slab isvsupported onl and-moved along a continuous supporting table; whichreceives the stone at one yend and dischargesthelcutfblocks at the otherend of theftable; Awhich operates automatically -und'er manual control;and lwhich issimple-and durable in construction, economical tomanufacture, easy to use, andeiective-and eiiicientin opera-tion.

Other objectsan'd advantages'willbecome apparent from a consideration ofthefollowing description and appended claims' in conjunction with ther-accompanying drawings wherein:

Figure 1 is av top plan-view of -a stone-*sawing apparatus illustrativeof the invention;

Figure 2 is a-side elevational lview 'oi the lapparatus illustrated inFigure'l Y '-Figure3"is a' fragmentary cross sectional view onanvenlarged scale taken-online 3-31of {Figlire 1; j l d Iig'u'freifl islva -fragmentaryfcross sectional Lvil'a'w on an'enlarged'scale -takenfon.the line 44-4 of Figure 1;

`Figure -5 isacross `sectional viewon the l-ne 5--5 of VFigure '4;

Figure 6l is a-fragmentary-cross y'sectionalview on an enlarged scale onthe line 6 6 of lFigurell;

V`Figure 7 is a fragmentary-cross sectionallview on the line "vl- 51of-Figurel; I

Figure 8 is la fragmentary cross sectionalyiew on the line 8--'8 ofFigure 7; Y

VFigure 9 is a fragmentaryy cross-sectional viewonthe linee-*9 ofFigure8;

Figure 10 is a'fragmentaryftop-'plan View `offa modified 'form `ofapparatus;

Figure'l-l is a fragmentaryV crossfsectional view on -anerlarged scaleon the-line I-I--I I -of'Figure 10; v Y

Figure -12 is -a'fragmentarycross sectional' view on the line I2-'I2ofFigure 11'; and

'Figure'l'is a fragmentary crossse'ctionalview on an'enlarged -scaleontheline -I3I3 'of Figure 41I). y

iWithv 'continued reference to `the l'-drawings, vthe appaiat'usdcomprises a tabla. generally Alindicated at I0, vand including elongatedside members II andl2 disposed in spaced apart' and substantiallyparallel'relationship and end members I3'and I4 disposed between andconnected at their ends to the side members one at each end of thetable.

A rst saw assembly including a plurality of spaced saws rotatable abouta common axis'is positioned with respect to the table I0 so that thesaws are spaced above the table with vthe axis extending longitudinallyof the table. Supporting columns I5 and IVG are disposed one at eachside of the table intermediate the length of the latter and similarcolumns I'I and I8 are'disposed one at each side of thetable and spacedfrom the columns I5 and I5 respectively. The rst-.saw assembly ismounted on the respective supporting columns for transverse back andforth movement with respect to the table IIJ. Specically, 'spaced apartand substantiallyparallel rods I9 and 2li extend between the supportingcolumns I5 and I6 and are secured at their ends to these 'columns at theupper ends of the latter to provide a guideway extending transversely ofthe table substantiallyperpendicular to the longitudinal center line-of'and disposed above the table. Similar rods 2| and 22 extend between thecolumns vI'I and I8 and are-secured at their ends to these columns atthe upper ends of therlatter to provide a second guideway 24 spaced fromand substantially parallel to the rst guideway 23 and extendingtransversely above the table I0 substantially perpendicular vto thelongitudinal center line of the latter.

YSlide blocks `25 and 26 are mountedv onthe guideways 23 and24'respectively and a rsti saw arbor or horizontal axis 21 is journalednear'its opposite ends inbearing blocks A2a and 2'9 depending from theslide blocks 25 and 26 respectively, the saw arbor 2l extendinglongitudinally ofthe table and being spaced above the table 'andsubstantially parallel thereto. Stone cutting saws 30 are mounted on thesaw arbor-'21 vv:at spaced apart locations therealong formovementtransversely ofthe table betweenthegui'd'eways 23 and 24. In oneoperative installation the saws 30 `are spaced apart approximately 154/2inches.v

An .electric motor 3I mounted on "the @slide block 25 and carries archain sprocket 32 voni'o'n'e end of its shaft 33. -A chain Vsprocket-34 is mounted -on thesawarborl near the cor-respondingend of the latterand a 'chain'35fextending faroundthe sprocketsS 2 and f3 4`drivingly4connectsthe-motor-'3I to vthesa'warbor-2l. f 1

A yoke Y36 is pivotally connecte'diat'fits ends. to the slide blocks 25`and 26 respectively and-a 3 tongue 31 is pivotally connected at one endto the yoke 36 at the center of the latter. The .tongue 31 projectssubstantially perpendicularly from the side member II of the table andextends slidably into one end of a cylinder 33 mounted at its ends onfixed supports 39 and 46 spaced outwardly from the table I6. A piston,not illustrated, is mounted on the end of the tongue 31 disposed withinthe cylinder 3S and fluid pressure conduits 4I and 42 are connected tothe cylinder 38 one at each end of the latter for moving the piston backand forth in the cylinder and consequently moving the slide blocks and26, motor 3l, saw arbor 21 and saws 36 back and forth transversely ofthe table.

The conduits 4I and 42 lead through a'suitable manually operated valvefrom a source of fluid under pressure so that the movement of the saws36 transversely of the table is subjected to manual control.

A second saw assembly including a plurality of spaced saws rotatableabout a common axis positioned in longitudinal spaced relation withrespect to the first saw assembly with its saws spaced above the tableI6 and its axis extending transversely of the table. Supporting posts 43and 44 are disposed one at each side of the table at locations spacedfrom the supporting posts I1 and I8 respectively in a direction awayfrom the posts I5 and I5 and on such posts 43 and 44 is xedly mountedthe second saw assembly. Specifically, bearing blocks or pillows 45 and46 are mounted on the upper ends of the posts 43 and 44 respectively. Asecond saw arbor or horizontal axis 41 is journaled near its oppositeends in the bearing blocks 45 and 46 and extends transversely of thetable I6 above the table and substantially parallel to the guideways 23and 24. Stone saws 53 are mounted on the arbor 41 at spaced apartlocations therealong, the spacing of these saws in the operativeinstallation referred to above being approximately one andthree-quarters inches.

An electric motor 5I is mounted on a supporting post 43 and a chainsprocket 52 is mounted on one end of the motor shaft 53. A chainsprocket 54 is mounted on the saw arbor 41 at the corresponding end ofthe latter and a chain 55 extending around the sprockets 52 and 54drivingly connects the motor 5I to the saw arbor 41.

A first conveyor or plurality of rollers 56 extend between the tableside members II and I2 from the end of the table at the side of the.slideways 23 and 24 remote from the saw arbor 41 to a locationsubstantially directly under the rod 22 ofthe slideway 24 nearest thesecond saw arbor 41.

As is particularly illustrated in Figures 4, 5 and 6, each of theserollers is provided with an axle 51 projecting at its ends from therespectively opposite ends of the corresponding roller and journaled atits ends in suitable bearings 58 and 59 carried by the side members IIand I2 of the table and each roller is provided with a cover 66 in theform of a cylindrical body of resilient material, such as rubber. Chainsprockets 6I are mounted one on each roller shaft 51 at the ends of theroller shafts adjacent the side member II and a chain 62 extends aroundVthe chain sprockets on the end rollers and engage all of the othersprockets to cause all of the rollers to rotate simultaneously in thesame direction and at the same speed. 1

An additional chain sprocket 63 is mounted on the end of the shaft ofthe end roller 56 adjacent the side member II and an electric motor 64is mounted on the adjacent supporting post I1. A sleeve 65 is rotatablymounted on the shaft 63 of the motor 64 and a chain sprocket 61 ismounted on the sleeve 65. A chain 68 extends around the sprockets 61 and63 and drivingly connects the sleeve 65 to the end roller 56 and amanually operated clutch 69 is connected between the motor shaft 56 andthe sleeve 65 to provide a manually operated power connection betweenthe motor 65 and the rollers 56.

When the clutch is engaged and the motor 64 in operation, the rollers 56are all driven in a direction to move a stone slab disposed thereon in adirection from the end of the table at the side of the slideways 23 and24 remote from the second saw arbor 41 toward the slideways, such astone slab being illustrated in Figure 1 and generally designated at 1U.

A second conveyor is arranged in end-to-end relation with respect to thefirst conveyor and is mounted on the table I9 for cooperation with thefirst conveyor. The second conveyor com- Y prises a shaft 1I whichextends between the table side members II and I2 adjacent andsubstantially parallel to the roller 56 and this shaft has spaced apartchain sprockets 12 thereon. A similar shaft 13 extends between the sidemembers I I and I2 at a location spaced from the side of the saw arbor41 remote from the end roller 56' and has spaced apart chain sprocketsthereon corresponding to the sprockets 12. Silent link chains 14 extendaround corresponding sprockets on the shafts 1I and 13 and each of thesechains passes through the space between two adjacent saws 50, as isparticularly illustrated in Figure 8. It is to be noted that the rst andsecond conveyors constitute a conveying means for the support andtransport of a stone slab to be cut.

A gear 15 is mounted on the end of the shaft 63 adjacent the supportpost 43 and a gear 16 is mounted on a stub shaft 11 projecting outwardlyfrom the frame side member II adjacent the shaft 13 and meshes with thegear 15. A chain sprocket 18 is mounted on the stub shaft 11 outwardlyof the gear 16 and a chain sprocket 19 is mounted on the second sawarbor 41 adjacent the bearing block 45. A chain extends around the..

sprockets 18 and 19 and this chain and the gears 15 and 16 drivinglyconnect the saw arbor 41 to the chain sprocket arbor or shaft 13 so thatthe chains 14 are driven in va direction such that their top runs movefrom the roller 56 toward the saws 50 when the second saw arbor 41 isdriven by the motor 5 I.

A manually movable stop 8| extends transversely of the table at alocation substantially directly below the slideway rod 22 and this stopcan be raised to a position at which it projects above the rollers 56,as particularly illustrated in Figure 3 to a position at which it isdisposed below the top surfaces of these rollers.

In the useof the device, a stone slab of predetermined thickness, forexample four inches, is placed on the rollers 56 at a location spacedfrom the side of the slideway 23 remote from the second saw arbor 41with the stop 8I raised the motor 46 is placed in operation and vtheclutch 69 engaged to drive the rollers until the front end of the stoneslab is brought against the stop 8|. With the motor 3| then in operationand driving the saws 30, the hydraulic or pneumatic device 38 isoperated to move the saws v33 .aieiegoei 12-tothe Lsidelmember`II'--therebycutting the stone slab into-^a1 pluraiityp strips Ieachapproximately? -four inches thiekfan'd :lifteen andv one-halfincheswide-and of' ai' length-equal tov the-widthA of thel originalslab. `Whenithe-savvs'J3l) l have :been moved'back-elear of theslab-'the stop -8I islowered 'and-the'lutchiGSfreengaged to move `thecutstrips-of stone past'- 'theI slideway fl 4 *and ontothe chains14,'the1stopxbeing' againfraised when these strips havelpassed thestopltoengage theifront 'end of@ the" remainder of lthe -Y slab and lthe 'clutch 68% is'fthen disengaged Landi-,he lhydraulic or pneumaticdevice again actuated? to= move: the sawsll transversely fof the table:toe-cut the lremainder-'of theslab'into stripsfthis operationbeing-repeated the''number"of times necessary for-the length lofslabrfbeingcut.

"The" strip lfirst* cut ffromf the v"iront end of the slab-will probablyI be "irregular on' its front-edge andl insuCh-caSe, willbe-remo've'd-from the 'chain table leading tol-the-saws50 "before itfreaches these-"saws `With-the motor-5| =in*operation, `as thefstripsseveredf'fromf theslab by the-saws' 30 movepast the-saws 50- they are-ou-t-I transversely thereof into brick shaped blocks which-are nowapproximate- 1y Ifour'inches ywide, fifteen and one-half inches long'and' one-andthree-quarters inches thick. These" blocks are vdischargedfrom the chain table onto rollers-850i a discharge table-86constitutingitheend portionvoflthe'ftable l-Dat the side ofthe sawarborl-41 remotefrom theslideways 23 and l2 4. The stone blocks' are removed-from the discharge table forstacking instoragef-piles or removal tovconstruction projects.

"-n the -modied arrangement illustrated in 4Figures' 1'0to 13 Ainclusivethe constructionisthe samefas? that illustratedy in Figures V1 to -9 1inclusive-'and'described --abovefuexcept Ythat the feed chains 14'iforthe saws'ill are omitted and power driven vfeed Vrollers 90 aresubstituted' therefor.

'The rollers -90 extend transversely of themachine frame between theside rails Il and i2 andeach Vroller -comprises -a shaft Jill,-journaled at'its'fends inlbearings-92 mountedl on the lside rails Illand I2,andfasleeve orcover `I 93 ofresilient 'materiaL such asvvulcanized rubber, coaxially v mounted on the shaft andextendingvbetween thevlside-rails H and t2.

"In the arrangement villustrated lthe bearings garemounted onthe-outersides of the side rails Aandthe end portions of the shafts -9l extendthrougn'holes inthesiderailsand into the corresponding bearings.

Vv1('Jhain'sproclrets 94 are mounted one on each roller'-shaft-9| -attheouterendsof the bearings 92-andan endlesschainfg extends around allofi-the chain A'sprockets -94 and-'constrains all of thelrollersiS torotateat the same speed and in ithesamedirection. V'l'hegear 15 ismounted onrthe endlrcllershaftila and is driven by the electric .motor5l 'through the chain sprockets 1=9;and.f,18,-chain 80'and gear 16,mounted von the stub shaft 11 carrying the chain sprocket .18,fandmeshing With .gear 15.

YThe .rollers :9011, vb' and ,90e nearest:v the :saws 50;are,provided-with. circumferential' grooves 96a, Sib, andncmespectivelywhichreceive the cutting-edges of thesaws- 5i),r vas isparticularlyshown infFigurell. Thegrooves 96brin .the roller .90bdirectly under-the saws are .deeper than the grooves i:illiazand 960 in.the irollers 90a and :90c at respectively fopposite :sides 'of f.;roller :98h :so that, the: sawl teethfully'.clearithelE rollers.

The-'rollers 190 -are contiguouslyY vdisposed;--al1l ng the -machineyframe and theirv operation is. substantially'ithesame as lthat of thechains :141-in supporting'the stone slabs and 'movingthezslafbs past thesaws y5l).

The invention may 'beembodiedin other: specinc forms without departingfrom..thefspirit 1or essential characteristics thereof. v.The presentembodiment is, 'therefore to be .considered fin all respects -asillustrative :and vnot restrictive, the rscope 'of .the invention beingf indicated 'by the appended yclaims rather "than lby 'l the lforegoingdescription, fand all. changes which- :come within-the meaning and rangeof equivalency of -f the claims, are, therefore, intended'to-'beieinbraced therein.

I1. Stone -sawingzapparatus comprising anselongated? table-,slidewaysdisposed` intermediate the length of f'said '.table `and L extending ftransverselyof the ltable above the same/inv spacedf apart-landsubstantially f parallel relationship to -each other,

slidesfmounted one onl eachslideway, a first saw4 one of-sai-'dlslidesand drivingly connectedto said first -saw arbor, 'fluid pressureVoperated lmeans supported adjacent said'table 'and connected'to said-slides Vfor movingV said saw arbor vandsaid saws backandforth-acrosssaid table, "bearing blocks ydisposed one ateach 'side'of saidta'bleatav location spaced'from'said slideways,a second saw arbor journaled'at its `ends V"in said bearing blocks and extendingtransversely 'ofsaid^"table above "the same, saws jmountedqon 'said 'second saw arborat` spaced apart i locations' therealong, power-means drivinglyconnected toisaid second saw TarbOLsaid'ta'b-le including power operatedmeans forl` moving stone slabs 'therealong 'in a direction'froml saidslidewaysto said second .saw arbor,an'd"releasable stop meanscarrie'd'bysaid table between said slideways and said second sawarbor'forholding stone slabs-stationaryon said table while beingtraversed by the saws on said first saw arbor.

2. .Stone sawing apparatus comprisinganelongated' table, ,slideways,disposedlintermediate .the length of said table .and extending.transversely of lthe table above the same inspaced apartandsubstantially parallel relationship to eachother, slides mounted one oneach slideway, a rstsaw arbor journaled atits .ends on.said slides .fand

extending v'longitudinally of said .table, .saws mounted on sai-d firstsaw5 arbor.v at spaced .apart locations 'therealong power means mountedon oneof said slides and drivingly .connectedto said rstsaw arbor, iluidpressure operated means supported adjacent said table and connected tosaid slides for moving said saw arbor and said saws .back and forthacrosssaid table, bearing blocks Vdisposed oneat each side iof .saidtable ata location spaced'from said slideways, a secondsawarbor'journaled at its ends'in said'bearing blocks and extendingtransversely of said 'table above the'same, saws .mounted o-n saidsecond saw'arbor at spaced 'Y apart locations therealong, powerV meansdrivingly connected to `said "second saw arbor, sai'dftable includingpower operated means for moving stoneslabs vtlierealong in a directionfrom said slideways to said second saw arbor, and releasable stop meanscarried by 4said table between said slideways =and said second sawia'rbor. for .holding stone-slabs stationary on said table while beingtraversed by the saws on said rst saw arbor, said power operated meansfor moving stone slabs along said table comprising power driven rollersextending from the slideway adjacent said second saw arbor in adirection away from said second saw arbor and power driven chainsextending from the slideway adjacent said second saw arbor under thelatter.

'3. Stone sawing apparatus comprising an elongated table,slidewaysdisposed intermediate the length of said table and extendingtransversely of the table above the same in spaced apart andsubstantially parallel relationship to each other, slides mounted one oneach slideway, a rst saw arbor journaled at its ends on said slides andextending longitudinally of said table, saws mounted on said rst sawarbor at'spaced apart locations therealong, power means mounted on oneof said slides and drivingly connected to said rst saw arbor, uidpressure operated means supported adjacent said table and connected tosaid slides for moving said saw arbor and said saws back and forthacross said table, bearing blocks disposed one at each side of saidtable at a location spaced from said slideways, a second saw arborjournaled at its ends in said bearing blocks and extending transverselyof said table above the same, saws mounted on said second saw arbor atspaced apart locations therealong, power means drivingly connected tosaid second saw arbor, said table including power operated means formoving stone slabs therealong in a direction from said slideways to saidsecond saw arbor, and releasable stop means carried by said tablebetween said slideways and said second saw arbor for holding stone slabsstationary on said table while being traversed by the saws on said firstsaw aber, said power operated means forrmoving stone slabs along saidtable comprising power driven rollers extending from the slidewayadjacent said second saw arbor in a direction away from said second sawarbor and power driven rollers extending from the slideway adjacent saidsecond saw arbor under the latter.

4. Stone sawing apparatus comprising an elongated table, slidewaysdisposed intermediate the length of said table and extendingtransversely of the table above the same in spaced apart andsubstantially parallel relationship to each other,

slides mounted one on each slideway, a rst saw arbor journaled at itsends on said slides and extending longitudinally of said table, sawsmounted on said rst saw arbor'at spaced apart locations therealong,power means mounted on one of said slides and drivingly connected tosaid first saw arbor, fluid pressure operated Vmeans supported adjacentsaid table and connected to said slides for moving said saw arbor andsaid saws back and forth across said table, bearing blocks disposed oneat each side of said table at a location spaced from said slideways, asecond saw arbor journaled at its ends in said bearing blocks Vandextending transversely of said table above the same, saws mounted onsaid Second saw arbor at spaced apart locations therealong, power meansdrivingly connected to said second saw arbor, said table including poweroperated means for moving stone slabs therealong in a direction fromsaid slideways to said second saw arbor, and releasable stop means pcarried by said table between said slideways and said second saw arborfor holding Ystone slabs stationary on said table while being traversedby the saws on said first saw arbor, the saws onv said rst saw arborbeingfspaced apartV a greater distance than the saws on said second sawarbor and said saw arbors being individually driven by separate powerplants.

5. Stone sawing apparatus comprising an elongated table, slidewaysdisposed intermediate the length of lsaid table andv extendingtransversely of the table above the same in spaced apart andSubstantially parallel relationship to each other, slides mounted one oneach slideway, a rst saw arbor journaled at Vits ends on said slides andextending longitudinally of said table, saws mounted on said rst sawarbor at spaced apart locations therealong, power means mounted'v on oneof said slides and drivingly connected to said rst saw arbor, fluidpressure operated means supported adjacent said table and connected tosaid slides for moving said saw arbor and said saws back and forthacross said table, bearing blocks disposed one at each side of saidtable at a location spaced from said slideways, a Second saw arborjournaled at its ends in said bearing blocks and extending transverselyof said table above the same, saws mounted on said secondY saw arbor atspaced apart locations therealong, power means drivingly connected tosaid second saw arbor, said table including power operated means formoving stone slabs therealong in a direction from said slideways to saidsecond saw arbor, and releasable stop means carried by said tablebetween said slideways and said second saw arbor for holding stone slabsstationary on said table while being traversed by the saws on said firstsaw arbor, said power operated means for moving stone slabs along saidtable comprising power driven rollers extending from the slidewayadjacent said second saw arbor in a direction away from said second sawarborand power driven chains extending from the slideway adjacent saidsecond saw arbor under the latter, said saw arbors being individuallydriven by separate power plants and said rollers being driven by amanually controlled power plant separate from the power plants drivingsaid saw arbors.

6. Stone sawing apparatus comprising a, horizontally disposed conveyingmeans for the support and transport of a stone slab to be cut, a rst sawassembly including a plurality of spaced saws rotatable about a commonhorizontal axis positioned so that the saws are spaced above saidconveying means with said axis extending longitudinally of the lattermeans, said assembly being mounted for traversed back and forth movementwith respect to said conveyingrv means, means operatively connected tosaid assembly for effecting the traversed back and forth movement of thelatter, and a second saw assembly including a plurality of spaced sawsrotatable about a common horizontal axis positioned in longitudinalspaced relation with respect to said rst assembly with its saws yspacedabove said conveying means and its axis extending transversely of thelatter means, said second assembly being ixedly mounted with respect tosaid conveying means.

'7. Stone sawingapparatus comprising ahorizontally disposed conveyingmeans for the support and transport of a stone slab to be cut, saidconveying means embodying a first conveyor and a secondconveyor arrangedin end to end relation with respect to said iirst conveyor, a first sawassembly including a plurality of spaced saws rotatable about a commonhorizontal axis positioned .so that the saws are spaced a'bove saidconveying means with said axis extending longitudinally of the lattermeans, said assembly being mounted for traversed back and forth movementwith respect to said conveying means, means operatively connected tosaid assembly for effecting the traversed back and forth movement of thelatter, a second saw assembly including a plurality of spaced sawsrotatable about a common horizontal axis positioned in longitudinalspaced relation with respect to said first assembly with its saws spacedabove said conveying means and 10 its axis extending transversely of thelatter means, said second assembly being xedly mounted With respect tosaid conveying means, and a stop interposed between the facing ends ofsaid first and second conveyors and movable vertically above and belowsaid conveyors for engagement with an end face of the slab to be cut.

WILLIAM D. JOHNSON.

No references cited.

